NHOM HYDROXYD KHO - NHOM HYDROXYD KHO Aluminii hydroxydum...

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NHOÂM HYDROXYD KHOÂ Aluminii hydroxydum siccum Nhoâm hydroxyd khoâ laø nhoâmoxyd ngaäm nöôùc, phaûi chöùa töø 47,0ñeán 60,0% Al 2 O 3 (P.t.l: 102,0). Tính chaát Boät traéng voâ ñònh hình. Thöïc teá khoâng tan trong nöôùc, tan trong caùc acid voâ cô loaõng vaø trong caùc dòch hydroxyd kieàm. Ñònh tính Dung dòch S : Hoaø tan 1,25 g cheá phaåm trong 7,5 ml acid hydrocloric (TT) baèng caùch ñunnoùng treân caùch thuûy vaø pha loaõng vôùi nöôùc thaønh 50 ml. Dungdòch S phaûi coù phaûn öùng cuûa ion nhoâm (Phuï luïc 8.1). Ñoä trong vaø maøu saéc cuûa dung dòch Dung dòch S khoângñöôïc ñuïc hôn hoãn dòch chuaån ñoái chieáu soá II (Phuï luïc 9.2) vaø maøu khoâng ñöôïc ñaämhôn maøu maãu VL 6 (Phuï luïc 9.3, phöông phaùp 2). Giôùi haïn kie àm Laéc 1,0 g cheá phaåm vôùi 20 ml nöôùc khoâng coù carbon dioxyd (TT) trong moät phuùt vaø loïc. Theâm vaøo 10 ml dòch loïc, 0,1 ml dung dòch phenolphtalein (TT) . Dung dòch
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